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The Enhanced Sensitivity of the Transmission Phase of a Quantum Dot to Kondo Correlations

P. G. Silvestrov·Y. Imry
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Abstract

The strong sensitivity of the transmission phase through a quantum dot embedded into one arm of a two-wave Aharonov-Bohm interferometer to the Kondo effect is explained. The enhancement takes place because of the buildup of the exchange scattering on the dot due to Kondo correlations even much above $T_{K}$. The enhanced exchange competes with the potential scattering, which is always weak. Both cases of the Anderson impurity model and a multilevel quantum dot are considered. In the latter case in addition to the description of peculiar phase behavior a mechanism leading to ferromagnetic Kondo coupling in quantum dots is proposed.

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P. G. Silvestrov, Y. Imry. 2002-10-22. The Enhanced Sensitivity of the Transmission Phase of a Quantum Dot to Kondo Correlations. https://doi.org/10.1103/physrevlett.90.106602

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